Improvement in riveting-mandrels



UNITED STATES PATENT OFFICE.

JAMES BERRY, OF BUFFALO, NEV YORK.

IMPROVEMENT IN R lvl-:TING-MANDRELS.

speeineenen' forming peut er Letters Patent No. 109,575, dated November 2Q, 1ero.

To all 1071,0712 t may concern.-

Be it known that I, JAMES BERRY, of the city of Buffalo, in the county of Erie and State of N ew York, have invented an Improved Riveting-llandrel, of which the following is a specification.

Heretofore, in the manufacture of sheetmetal pipe formed by bending the sheet of metal and riveting together the overlapping edges on a round bar or mandrel, the rivets have been separately inserted by hand and riveted one at a time, which involves considerable time and labor.

The object of my invention is the construction of a riveting-mandrel adapted to receive and hold all of the rivets required for a joint or section of pipe, and at a relative distance apart to correspond with the holes therefor in the pipe, which is then arranged on the mandrel, so that the upwardly-projecting ends of the rivets, which coincide with the holes in the pipe, will readily enter the same, so as to enable all of the rivets to be clinched or headed by a single continued operation without removing or changing the position of the npe.

l The invention consists, first, in the arrangement, in a longitudinally-grooved mandrel, of socketed clamping-bars to hold the rivets until they are inserted in the pipe, and an elevating mechanism to expel them from the sockets after they have been inserted, and permit the mandrel to be turned to bring uppermost and under the heads of the rivets a' solid portion thereof to receive the concussions of the riveting-hammer; second, in the arrangement of levers, wedges, and connecting-rods at the ends of the elevating-bar to operate the same, as aforesaid; third, in the arrangement of a curved spring and stop for holding the wedge in either of its two positions of engagement or disengagement with the elevating-bar, fourth, in the combination and arrangement,with my improved mandrel, of a clamping device for holding the two edges of the pipe together during the riveting process.

- In the accompanying drawings, Figure I is a sectional elevation of the mandrel and standard. Fig. Il is an end elevation thereof. Fig. III is a plan View thereof. Fig. 1V is a cross-section of the mandrel and fender on line a" x. Fig. Vis a cross-section on line yy.

Fig. VI is a sectionalelevationof the mandrel, illustrating the working of the pins. Fig. VII is a cross-section on line z z.

Like letters designatelike parts in each of the figures. y n

A is the body of the mandrel, consisting Jof a cylindrical bar of metal. A dovetail groove, a, is arranged longitudinally therein, in the bottom of which is made a groove, b, of rectangular cross-section, both running from end to end through the mandrel A. Longitudif nally in groove ct t two clamp-bars, A A2,V the jaw A being stationary, while the jaw A2 is made a little narrower, so as to be'able to be moved to and from the jaw A to the yevtent of the play in said groove.

B is a bar, rectangular in cross-section, fitting in groove b, but not quite as deep as the groove, so as to leave a little play vertically between the bar B and jaws A A2, as shown in Fig. IV. It is provided with a series of pins, b', corresponding in number and ar rangement to the rivet-holes in the piece of pipe to be riveted. semi-cylindrical notches a in the blocks A A",

surface of the mandrel, so that when the bar Bis in its lowest position, as represented in top of pins `b as a bottom ,will be large enough to receive a rivet-head. The length of the bars A A2 must ybe in excess of the length of dovetail keys running transversely through the bars A A2 and the mandrel, so as to secure said bars in their relative position. The stationary j aw A A:may further be secured by a set-screw, b, passing through acollar, s,

the jaw. The adjustments of the movable jaw AL is effected by screws a a, one at each end of the jaw. These screws pass through the mandrel and work in threads cut therein, and take hold of the end of the jaw A'2 in such a manner that the jaw will follow the movement of the screw in either direction. The head of the'screw is preferably countersunk, as represented in Fig. V. The vertical movement of the lower bar, B, is effected by wedges b2 b, arranged in the groove so as 'to bear against the beveled edges of said bar. By

forcing the wedges against this bar the latter These pins pass throughand in their normal position stop short of the Y Fig. IV, the socket formed bythe semi-cylin-l drical notches in jaws A A2 as sides, and the pipe usually riveted on the mandrel.y b6 are surrounding the mandrel and bearing againstl is elevated in the direction of the pins b.

` The wedges ZL are worked byconnecting-rods b, pivoted to the wedges and levers if, the latter being of the rst order and pivoted in pieces C, arranged in the dovetail groove a, next to the clamp-bars A A2. The lower end of lever b* takes hold of the conn'ectinglrod, while the upper end is hidden in piece C and worked by means of a wrench or handle, c, the socket of which receives the end ot' lever bi. The eonnecting-rod b3 is formed on its upper side with a stop-enlargement, c?, which engages with a spring, e, fastened to the under side of piece C, and bent at its end, so as to hold the wedge b2 either in engagement with the bar B, while elevating the same, as represented in Fig. VI, or in its opposite posi- `tion, as shown in Fig. I.

D D are end blocks filling the remainder of the dovetail groove a and rectangular groove b at the ends of the jaws and lever-fulcrum pieces C, so as to give the mandrel a smooth cylindrical appearance. They are secured in place by countersunk screws d. The standard supporting the mandrel consists of a stationary base, E, provided with a square shank, c, fitting in a socket in the bench K, and secured by a key, ci. This base E is constructed with a cylindrical socket, c, in the top thereof, which receives a cylindrical shank, ,f, at tached to the upper portion ot' the standard. A set-screw, e', passing through the metal 'of said socket and bearing against the shank j", may secure the latter in a iixed position, if desired. The upper portion of the standard is vcut horizontally in halves F F', hinged together at the rear at f. A locking-pin, j, fastened to part F and fitting in a socket in part F, helps to secure the halves in their relative position against lateral movement when resting on cach other. Thelower half, F, carries the cylindrical shank f, already 1nen honed, while the upper half, F', is provided with a horizontal cylindrical socket, f, of a size to receive the mandrel A. The end of the mandrel fitting in this socket is constructcd with a circular groove, f, in which engages a spring-catch, f5, Fig. III, attached to part F ofthe standard, the hook ofthe same passing through an opening in the socket f. This arrangement prevents the accidental disengagement of the mandrel from the part F until the spring-catch is released. Aset-screw, f passing through part F and bearing against the mandrel, serves ,to hold the latter from turning in its socket when it is required to be stationary.

It will be seen from the foregoing that the shank f enables the entire upper part of the standard and the mandrel attached thereto to swing in a horizontal plane, and that the hinge f enables the bearing F and the mandrel secured therein to swing in a vertical plane, while the mandrel itself maybe turned in the socket in part F around its own axis when not secured by the set-screw f L G is a bent rod or arm rigidly attached to the lower portion, E, of the standard, and extending vertically to a point a little above the center of the mandrel, from whence it runs,

parallel to the same, to apoint near the opposite end thereof, when it turns toward the inandrel and terminates in a hook, f/,whieh forms a rest and support for the mandrel at that point, as clearly shown in Figs. II and III. This rod forms at the same time afulcrum for a device which serves to hold the edges of the pipe together before and during the operation of riveting the same. It consists of a bar, II, preferably provided with fingers 71., proj eeting into the spaces between the rivets. This bar is supported by-arms h ,from the fulcrum-rod G, and is held away from the mandrel, in the position shown in Fig. lV,by springs 11.,bearing against arms if. The arms 7L extend beyond the fulcruni-rod G and take hold oi a rod, I, which runs parallel to rod G, and, following the bend of rod G, at its free end is pivoted to the same at t', whence a curved arm, fi, extends downward and connects by means of a rod, t,

with a stirrup, i, Fig. I. By pushing down the stirrup the rodI is swung upward on the pivot fi, and the clan1p-bar I-I pressed down upon the outer edge of the pipe B, so as to clamp its two edges together against the mandrel, as represented in dotted lines, Fig. IV. Upon releasing the stirrup the parts are thrown back into their former position by means of the springs h.

The operation of my device is as follows: The pin-bar B being in its lower position, the rivets are placed with their heads below in the cavities a', formed between the jaws AA?, and clamp ed therein by turning the screws a, which adjusts the movable jaw A2. The piece of pipe to be rivetcd,with the rivet-holes already punched, is then placed on the mandrel in such a manneras to cause the rivet-holes to coincide with the rivets on the mandrel,when the rivets will readily enter the holes. By applying the pressure Iof the foot to the stirrup f6 the finger-bar I-I clamps the edges of the pipe together, as above described. The movable jaw-bar A2 is then loosened and the pinbar B forced upward by the wedges bworked by the levers b3, whereby the rivets are elevated out of their sockets and above the sur face of the mandrel. This permits the mandrel to be turned on its axis, so as to bring a solid portion thereof under the rivets preparatory to heading them.

In order to apply and remove the pipe, it is necessary to disengage the mandrel from the hook of supporting-rod G, which is easily ac complished by swinging the same upwardly on the hinge f, and then turning the mandrel and the upper portion of t-he standard in the socket c.

That I claim as my invention s l. The combination and arrangement of th rivet-eleif'ating bar B and mechanism for elevating it, pins b', socketed clamp-bars A A2, and mandrel A, as and for the purpose here inbefore set forth. i

2.' The combination and arrangement of the Wedges b2, levers b4,oonneotingrod bwith the bar B, pins b, clamps A A2, and mandrel A, as and for the purpose set forth.

3. The combination and arrangement of the curved spring c3, with the stop-enlargement cL on connecting-rod b3, Wedges b2, elevatingbi1-r B, pins b', and mandrel A, as and for the purpose set forth.

4. The combination of the clamping-bar H, arm G, riveting-mandrel A, constructed as described, and standard-bearing E F F', arrzm ged an d op erating as l1 erenbefore set forth.

JAMES BERRY. Witnesses:

JNO. J. BONNER, R. B. DEVE'NPORT. 

